Release 1.0.0

What's Changed

• Drop support of go 1.13, 1.14, and 1.15 by @OldPanda in #16
• Deprecate ioutil by @OldPanda in #17
• Uncapitalize error messages by @OldPanda in #18
• Upgrade github actions by @OldPanda in #19
• Update readme by @OldPanda in #20

Full Changelog: v0.2.0...v1.0.0